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單項(xiàng)選擇題

Hearing a strong noise, （） at once.

A.the engine stopped
B.the engine was stopped
C.he stopped the engine
D.he had stopped the engine

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單項(xiàng)選擇題

（） that everything in the engine crankcase is correct, start up the crankcase lubricating oil pump.

A.To satisfy
B.To be satisfied
C.After satisfying
D.After being satisfied

單項(xiàng)選擇題

Cooling （） the engine metals retain their mechanical properties.

A.forces
B.enables
C.makes
D.is able to

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